| 单词 | Einstein equation |
| 释义 | Einstein equation 1 The mass-energy relationship announced by Einstein in 1905 in the form E = mc2, where E is a quantity of energy, m its mass, and c is the speed of light. It presents the concept that energy possesses mass. See also relativity. 2 The relationship Emax = hf - W, where Emax is the maximum kinetic energy of electrons emitted in the photoemissive effect, h is the Planck constant, f the frequency of the incident radiation, and W the work function of the emitter. This is also written Emax = hf - φe, where e is the electronic charge and φ a potential difference, also called the work function. (Sometimes W and φ are distinguished as work function energy and work function potential .) The equation can also be applied to photoemission from gases, when it has the form: E = hf - I, where I is the ionization potential of the gas. |
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